The vibration monitoring industry has specialized jargon that is commonly used when talking about vibration sensors, accelerometers and associated applications. It's important that you understand common terminology to communicate effectively with vibration monitoring, reliability, condition monitoring and process automation professionals. We hope you find our glossary useful to find specialized terms and definitions used across vibration, condition monitoring and predictive maintenance.



The interval between two frequencies differing by exactly 2:1.


The electrical signal measured at the output terminals which is produced by an applied input to a transducer.


The open-circuit equivalent generator impedance, expressed in equivalent value of resistance, and inductance or capacitance, in series or parallel with the output generator. The effective internal impedance in series with the output terminals of an amplifier or circuit.


Resistance measured on the signal output leads of a piezoresistive device. By convention, these are the green and white wires.


The maximum time for an amplifier to return to a minimum defined level of linear operation following an input overload of defined amplitude, duration, and pulse shape.


The maximum pressure or load which may be applied to the transducer without causing a permanent change in the performance specifications.


The amount of output measured beyond the final steady-state output value, in response to a step change in the measurand.